Transmission line device



y 1931- N. A. WAHLBERG- 1,806,321

TRANSMISSION LINE DEVICE Filed Feb. 4, 1929 2 Sheets-Sheet l {NVENTOR Y ATTORNEY M y 19, 1931. N. A. WAHL-BERG 1,806,321 TRANSMISSION LINE nnvrcm Filed Feb. 4. 1929 2 Sheets-Sheet -2 INVENTOR ATT'oRNEY Patented May 19, 1931 UNlTED STATES PATENT OFFICE ILS A. wAHLEERe, F EEEEY, PENNSYLVA IA, ASSIGNOR TO WESTINGHOUSE ELEc- TRIG & MANUFACTURING coMPANY, A coEPoRATIoNo PENNSYLVANIA TRANSMISSION L NE DEVICE Application filed. February 4, 1929. Serial No. 337,249.

My invention relates to transmission-line devices and particularly to means for mounting field-control elements relativeto highvoltage insulators.

1 One object of my invention is to provide a device of the above indicated character that shall be simple and durable in construction, economical to manufacture and effective in its operation.

Another object of my invention is to provide an insulator and a field-control element that may be readily mounted and dismounted relative to each other. I

Another object of my invention is to pre- Vent angular displacement between aninsulator and a cooperating field control element therefor.

Another object of invention is to pro Vide an insulator that shall be adapted for the selective reception of any of several field control elements of different character.

A further object of my invention is to provide an insulator and a field-control. element that shall have a substantially plug and socket connection between them.

The problem of attaching field-control ele ments, such as arcing horns, distributor rings and grading shields, to high-voltage transmission-line insulators, particularly of the series-string suspensiontype, has been relatively difiicult and expensive. Various factors contribute to the difficulty of economically mounting the field-control elements, such as the relatively great lateral extent of certain of the horns and rings, the small crowded space near the axis of the insulator where the elements are attached, the desirability of maintaining the elements in fixed position relative to the insulator, and other considerations. I

Further, where grading Shields are placed between Several of the units of a suspension insulator, considerations quite different from those in mounting horns and rings sometime arise. 'A ring, unless divided, cannot be placed on or removed from a suspensionin- .sulator without detaching the insulator from its main support or from the conductor which .it supports.

In general, there has been a wide diversity the arcing horns.

between the means for attaching horns, rings, and shields and a change from one to another of these field-control elements has not been a simple. or inexpensive matter.

It is my aim to overcomemany'of the obj ections heretofore arising in connection with controlling the fields of high-voltage suspension insulators. 7

Accordingly, in practicing my invention, 1 provide aninsulator element and a joint or holding means that is so adapted for use in connection with either a horn, a ring or a shield as to render any one of these devices of itself more readily and economically adapted to the insulator and to render all of them interchangeably so adapted.

Figure 1,- of the accompanying drawings, is a top plan view of a device embodying my invention,

.Fig. 2 is a side elevational view of the device shown in Fig. 1, I

Fig. 3 is a View, similar to Fig. 2, of a modifiedform ofmy invention,

Fig. 4 is a view, inside elevation, of a series String of suspension insulator units, illustrating the invention as applied to voltage grading shields, I

Fig. 5 is a view'similar to Fig. 1 of a modified form of my invention, and

Figs. 6 and 7 are side views partially in. elevation and partiallyin section of further modifications of my invention; 7'

Referring to Figs. 1 and 2 the device here illustrated shows my inventionas applied to The device comprises, in general, an insulator of a usual cap and pin type comprising a porcelain member 2 and a metal cap 3, and field control elements or arcing horns 4. The cap; 3 is provided with sockets or grooves 6 of substantially dove-tail formation extending in the general direction of the longitudinal axis of the cap or of the insulator.

structed of strap metal having inner endportions 8 of substantially clove-tail formation "for cooperation with the grooves 6 and outer end portions9 for controlling the field or flash-over of the insulator.

The arcing horns 4 are preferably coni ion mentioned. V

In each of the forms of my invention illus- WVhile in Figs. 1 and 2, fourof the grooves in the previous figures, but, instead ofthe horn or horns 4, a distributor ring 10 is provided.

The ring 10 comprises an annular or ring like field-distributing portion 12 and radial supporting arms 14therefore having inner endsx8, similar to the ends 8 ofthe horns 4 in Figs. 1 and 2, for cooperation with the grooves 6. r I I In Fig. 4 a series of'units, each comprising the insulator 2 and the cap 3 of the previous figures, areillustrated, it being understood that-the units oi"?- the other figures are for similar 'series stri'ng suspension as illustrated in F ig. 4. However, in this form, instead oi the arcing horns 4 or "the rings 10, the caps 3 below the upper cap are provided with voltage-grading" shields 16 of various sizes =01- surface areas in accordance with the voltage gradient desired.

In Fig. 4, the caps 3 are also similarto the caps?) in Figs. 1, 2 and3, thus illustrating how the same caps are adapted for the selective reception of one of a variety of field controlling elements, which the horns'4, the ring 12 and the shields 16 constitute.

In the form of my invention shown in Fig.

5', the cap 3, instead of having longitudinally-extending dove-tail grooves or sockets 8,

is provided with longitudinal dove-tail projections or flanges 18, and'the arcing horn 4,

. or other field-control element is provided with a groove or grooves 19 for cooperation with one or a greater number of the projections 18. i r Z I In the form of my invention illustrated in Fig. 6, the grooves 6 and the projections 18 on the caps 3 of the previous figures are replaced by laterally projecting lugs 20 having longitudinal apertures 21 therein for the reception of inner end or ends 22 of an arcing born or horns 23or other of the elements trated in Figs. 1 to 6, inclusive, the horns,

rings and shields are placed'in position by 7 simple downward thrust movements- In the form of my invention shown in Fig. 7 the apertured lugs 20 of the structure shown in Fig. 6 are replaced by laterally and upwardly projecting lugs 24 for the reception of an apertured downwardly and outwardly projecting portion 25, representing an inner end of any of the elements 4,- 10 or 16, which may be placed thereon by turning the horn portion through an angle of substantially In any of the forms of the invention illustrated the field-control element may be permanently secured in position by merely peening over one of the adjacent ends of the fieldcontrol element or the holding means on the cap, or, where this peening operationisomitted,the field control elements may be readily removed and replared by simple thrust movements.

By reason of the annular spaced relation of the holding means on the cap, such as the grooves 6, the projections 18 and the lugs 20 and 24, the field-control elements 4, 10 and 16 are held in fixed relationabout the axis of the insulator.

'The local positioning of the holding means on the cap may also berutiliz'ed for,holding separable halves of therings' 10 and shields 16,

advantages are obtained which render the in p vention va distinct improvement in its field.

lar forms of' my invention, changes 'may be effected therein without departingfrom the spirit and scope thereof as set "forth inthe appended claims. 7 j

claim as my invention: 1. A transmission-line device comprising an insulator-of the cap and-pin type and a field-control. element, one of said cap and field-control elements having a substantial ly plug portion andthe-other a cooperating substantially socket portion for positioning 7 thefield element relative to the insulator.

2. A transmission-line device comprising an insulator of the cap-andspin type and a field-control element, one of said cap and field-control elements having a substantially plug portion and the other a cooperatingsubstantially socket portion for positioning the field element relative to theinsulator, the axes o'fsaid portions being disposed aside,

vand extending longitudinally relative to the axis of the cap.

3. A transmission-line device comprising an insulator element and a field-control element one of which embodies a substantially plug portion and the other cooperating subments together, the axes of said portions extending m the general direction of, and being While I have shown and described particupal stantially socket portion for fitting the ele disposed aside, the longitudinal axis of the insulator.

4. A transmission-line device comprising an insulator of the cap-and-pin type, the ca having a plurality of holding portions, eac

constituting one element of a substantially plug-and-socket connector, spaced angularly thereabout, and field-control means held in poistion by said portions.

5. A transmission-line device comprising an insulator of the cap-and-pin type, the cap having a plurality of longitudinally-extending holding portions, each constituting one element of a substantially plug-and-socket connector, spaced angularly thereabout, and

field-control means held in position by said portions.

6. A transmission-line device comprising an insulator element and a field-control element one of Which embodies a substantially dove-tail groove portion and the other a cooperating dove-tail portion for fitting the elements together.

7. A transmission-line device comprising an insulator element and a field-control element one of Which embodies a substantially dove-tail groove portion and the other a cooperating dove-tail portion for fitting the elements together, said portions extending in the general direction of the longitudinal axis of the insulator.

8. A transmission-line device comprising an insulator of the cap-and-pin type, a fieldcontrol element having a slip connection to the cap of said insulator and means for preventing displacement between the cap and the element.

9. A transmission-line device comprising an insulator of the cap-and-pin type, a fieldcontrol element having a slip connection to the cap of said insulator in the general direction of the longitudinal axis of the insulator and means for preventing displacement of the element about said axis.

10. A transmission-line device comprising an insulator of the cap-and-pin type, the cap having a centrally-disposed mounting portion at its closed end and a portion constituting one element of a substantially plugand-socket connector.

In testimony whereof, I have hereunto subscribed my name this 26 day of Jan. 1929.

NILS A. WAHLBERG. 

